use this to change the tables headers
$extTypes: associative array of extensions types
+'SpecialVersionVersionUrl': called when building the URL for Special:Version
+$wgVersion: Current $wgVersion for you to use
+&$versionUrl: Raw url to link to (eg: release notes)
+
'SpecialWatchlistFilters': called after building form options at Watchlist
$special: the special page object
&$filters: associative array of filter definitions. The keys are the HTML name/URL parameters.